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Installation info

2.2.12 - HYDRAULIC CONNECTION

Before installing the boiler we recommend that
the system be cleaned to remove any impuri-
ties which could originate from components
and which could risk damaging the circulating
pump and heat exchanger.

Note: The use of solvents could damage

the components of the heating cir-
cuit.

Basing on the feeding water
hardness, it has to be
considered the opportunity to
install appropriate devices for

fig. 16

INSTALLATION WITH BENDED PIPES
(00361193 kit pipes)

INSTALLATION WITH VALVES
(00 00361193)

INSTALLATION OF BEBDED PIPES AND PRESSURE FITTING 00361265

OPTIONAL CONNECTION KITS

water treatment (for domestic use).
With feeding water hardness higher than 14°f
it’s always recommended the water treat-
ment.

2.2.11 -

CONNECTION TO THE GAS
MAINS

The supply pipe must have a section which is
the same as or greater than the one used in
the boiler.
Comply with the applicable local installation
requirements which shall be considered as
having been incorporated in full in this ma-
nual.
Before opening the internal gas supply system;
i.e. before connecting the gas meter, all seals
must be checked.
If any part of the system is concealed the seals
must be checked before the pipes are cove-

red.
The seal test must be conducted using air or
nitrogen at a pressure of at least 100 mbar.
The commissioning of the boiler also inclu-
des the following operations and checks:
-

Opening of the gas gate valve and venting
of the air contained in the piping and ap-
pliances, proceding appliance by
appliance.

Check, with the gate valve of all the ap-

pliances Off, that there are no gas leaks.
During the 2

quarter of a hour from the

beginning of the test no pressure reduc-
tion is to be detected on the gas pressure
gauge. If gas leaks have to be found, use
only water soap solution or any other spe-
cific gas leak detector which can be avai-
lable on the market. Never look for gas
leaks using a naked flame.

While connecting gas inlet pipe of the boiler to the pipe coming from
gas network, it is MANDATORY to insert a TIGHT GASKET, whose
dimensions and material must be adequate. Connection is NOT sui-
table for hemp, teflon strip or similar materials

HEATING

The heating flow and return must be con-
nected to the relevant ¾” connections of the
boiler

and

(see fig. 4).

When determining the size of the heating
circuit pipes it is essential to bear in mind the
pressure losses induced by radiators, any
thermostatic valves, radiator cut-off valves
and the configuration of the system.

We recommend that the discharge of the
safety valve mounted in the boiler be con-

For the lower connections po-
sitioning, see the mounting jig
of figure 4

veyed into the sewer.
If this precaution is not taken, activation of
the safety valve may result in flooding of the
room where the boiler is installed.
UNICAL shall not be held responsible for
damage caused by non-observance of this
technical precaution.

D.H.W.

Inlet and outlet of D.H.W. must be connected
to the relevant ½” connections of the boiler

and

(see fig. 9).

The hardness of the supply water affects

the frequency of the cleaning of the heat
exchanger.

fig. 17

6,2
6,0
5,8
5,6
5,4
5,2
5,0
4,8

4,6
4,4
4,2

4,0
3,8
3,6

3,4
3,2
3,0
2,8
2,6
2,4
2,2
2,0
1,8
1,6
1,4
1,2
1,0
0,8
0,6
0,4

0,2